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de·cay (d-k)
v. de·cayed, de·cay·ing, de·cays
v.intr.
1. Pathology: To decline in health or vigor; waste away.
2. To decline from a state of normality, excellence, or prosperity; deteriorate.



un·du·la·tion (nj-lshn, ndy-, -d-)
n.
1. A regular rising and falling or movement to alternating sides; movement in waves.
2. A wavelike form, outline, or appearance.
3. One of a series of waves or wavelike segments.